Synthesis, properties, and reactions of α- and β-D-glucopyranosyl esters of some tripeptides
作者:Štefica Valenteković、Dina Keglević
DOI:10.1016/s0008-6215(00)85517-2
日期:1980.6
chromatography into the pure isomeric forms. Catalytic hydrogenolysis of the beta anomers, in the presence and absence of a strong acid, yielded the free 1-esters 2 beta, 9 beta, and 14 beta, which were characterised as the monoxalate or trifluoroacetate salts and as free bases. Similarly, the alpha anomers afforded 2 alpha, 9 alpha, and 14 alpha, whereas omission of the strong acid led to accompanying 1
由2,3,4,6-四-O-苄基合成2,3,4,6-四-O-苄基-1-O-(N-苄氧基羰基三肽基)-D-吡喃葡萄糖),8和13。 -α-D-吡喃葡萄糖和在咪唑存在下合适的N-保护的三肽(Gly-Cly-Gly-,L-Phe-Gly-Gly-和Gly-Gly-L-Phe-)的活性酯;分离异头物混合物并表征α和β异头物。含有Gly-Gly-Phe-的L和D对映异构体(比例约为3:1)作为糖苷配基的13的β异构体可以通过柱色谱法分离为纯的异构体形式。在存在和不存在强酸的情况下,β端基异构体的催化氢解反应会生成游离的1酯2 beta,9 beta和14 beta,它们被表征为一x酸酯或三氟乙酸盐和游离碱。同样,α异头物提供2个α,9 alpha和14 alpha,而忽略强酸会导致伴随的1导致2的酰基迁移,从而生成2-O-酰基衍生物。将所有制备的化合物转化为N-乙酰基和/或过乙酰化衍生物。带电和不带电形式的1酯2